If you are speaking of disc brake rotors, the thickness of the rotor is measured with a micrometer to determine if there is enough material left to reuse or machine the rotors for service. Each rotor has a specified minimum requirement. To reuse a rotor that doesn't meet the minimum requirements is illegal and unsafe.
Most likely warped brake discs
no need to replace wheel bearing unless the wheel bearing is worn out
No. Wheel bearings can only be tested by shaking and rotating the wheel.
Try replacing your brake calipers.
It should be 4-wheel disc brakes all the way around.
Support discs are arranged normal to the screen axis and on opposite end pieces of the cylindrical screen, and portions of the screen holder are disposed in the space between the axially normal support discs of the screen end pieces and the cylindrical screen per se, whereby the support discs of the screen end pieces are rotatably supported adjacent the cylindrical screen by axial bearings carried preferably by the discs and engaging on portions of the screen holder as interposed between the axially normal support discs and the cylindrical screen. The support discs are preferably interchangeable on different screens and are preferably formed as radially projecting annular discs. Furthermore the support disc of at least one of the two screen end pieces can have outer peripheral serrations to serve as a ratio wheel and/or synchronous driving wheel of the cylindrical screen.
Depends on what kind of "discs" you're referring to... (compact discs? brake discs?)
what is difference between compact discs and digital versalite discs
discs
Jack up and block the car. Remove wheel, remove brake caliper. Rotor is now free.
NASCAR race cars have four-wheel power disc brakes with ventilated discs. They're a lot like the brakes on a street car, with two major differences: the discs are a lot thicker - and at a track like Martinsville there's a lot more space between the discs to help carry off the heat; and the pads are made to work at very high temperatures.
Posibilities are During braking Warped brake discs (rotors) Worn suspension components Excessive play in a front wheel bearing During normal driving Wheels out of balance Tyre out of shape damaged road wheel.